| 150 | = | 1 2 | a | ( | 35 2 | ) | ( | 35 2 | ) | + | 35 2 | ( | 20 | − | 35 2 | a | ) |
| 方程右边 = | 1 2 | a | × | 35 2 | ( | 35 2 | ) | + | 35 2 | ( | 20 | − | 35 2 | a | ) |
| = | 35 4 | a | ( | 35 2 | ) | + | 35 2 | ( | 20 | − | 35 2 | a | ) |
| = | 35 4 | a | × | 35 2 | + | 35 2 | ( | 20 | − | 35 2 | a | ) |
| = | 1225 8 | a | + | 35 2 | ( | 20 | − | 35 2 | a | ) |
| = | 1225 8 | a | + | 35 2 | × | 20 | − | 35 2 | × | 35 2 | a |
| = | 1225 8 | a | + | 350 | − | 1225 4 | a |
| = | - | 1225 8 | a | + | 350 |
| 150 | = | - | 1225 8 | a | + | 350 |
1225 8 | a | = | 350 | − | 150 |
1225 8 | a | = | 200 |
| a | = | 200 | ÷ | 1225 8 |
| = | 200 | × | 8 1225 |
| = | 8 | × | 8 49 |
| a | = | 64 49 |
| a | = | 1.306122 |